EP3730263B1 - Method for producing a plurality of cast elements made of prestressed concrete - Google Patents

Method for producing a plurality of cast elements made of prestressed concrete Download PDF

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Publication number
EP3730263B1
EP3730263B1 EP19450007.0A EP19450007A EP3730263B1 EP 3730263 B1 EP3730263 B1 EP 3730263B1 EP 19450007 A EP19450007 A EP 19450007A EP 3730263 B1 EP3730263 B1 EP 3730263B1
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EP
European Patent Office
Prior art keywords
tensioning
elements
concrete
separating
cast
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP19450007.0A
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German (de)
French (fr)
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EP3730263A1 (en
Inventor
Peter EICHBERGER
Wolfgang HÖLZL
Anton Schaffer
Rolf RÜHLING
Winfried Mohr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine Turnout Technology Zeltweg GmbH
Voestalpine Railway Systems GmbH
Original Assignee
Voestalpine Turnout Technology Zeltweg GmbH
Voestalpine Railway Systems GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Voestalpine Turnout Technology Zeltweg GmbH, Voestalpine Railway Systems GmbH filed Critical Voestalpine Turnout Technology Zeltweg GmbH
Priority to EP19450007.0A priority Critical patent/EP3730263B1/en
Priority to PL19450007T priority patent/PL3730263T3/en
Priority to US17/605,462 priority patent/US12011849B2/en
Priority to PCT/IB2020/053793 priority patent/WO2020217181A1/en
Publication of EP3730263A1 publication Critical patent/EP3730263A1/en
Priority to SA521430650A priority patent/SA521430650B1/en
Application granted granted Critical
Publication of EP3730263B1 publication Critical patent/EP3730263B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/043—Wire anchoring or tensioning means for the reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
    • B28B23/024—Supporting means
    • B28B23/026—Mould partitionning elements acting as supporting means in moulds, e.g. for elongated articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/046—Post treatment to obtain pre-stressed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/06—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed for the production of elongated articles

Definitions

  • the present invention relates to a method for producing a large number of cast concrete elements from prestressed concrete, in particular for the production of railway sleepers, in a long bed having a multiple of the length of a cast concrete element, in which separating elements are used in the long bed to define the length of the cast concrete elements to be cast, and a device for carrying out the method according to the invention.
  • U.S.A. 4,272,875 discloses a method and apparatus for producing a plurality of concrete castings from fiber reinforced concrete, according to the preamble of claim 1 and claim 11 respectively.
  • prestressed concrete railway sleepers there are two methods of transmitting a prestressing force to the concrete casting.
  • the clamping elements or the clamping wires have suitable surface structures or a clear roughness in order to achieve sufficient adhesion of the concrete element so that the desired prestressing can be applied.
  • the prestressing is removed and the tensioning elements or the tensioning wires transfer a corresponding tension to the concrete body, for example to the railway sleeper, via the direct bond with the concrete.
  • end tensioning in which the tensioning force is applied to the concrete casting element or the railway sleeper by tensioning the tensioning wire only after the concrete has hardened.
  • the prestressing element or the prestressing wire must not have any significant adhesion to the concrete of the cast part, since the prestressing force should only act on suitable anchors.
  • a significant advantage of the end anchorage is that the prestressing is constant over the entire sleeper body and thus the susceptibility to cracking under stress can also be significantly reduced in the end area of the concrete sleeper.
  • the long-bed method for prestressed railway sleepers on the one hand and the carousel method on the other hand are known as manufacturing processes, especially for the production of end-tensioned concrete sleepers.
  • support plates or separating elements are placed in long beds according to the desired concrete sleeper length, with the length of the long bed being a multiple of the length of a cast concrete element (approx. 100m).
  • the tensioning wires are pulled through the separating elements over the entire length of the long bed and tensioned using a separate tensioning frame or using foundations with appropriate abutments. Then the concrete is poured.
  • the sleeper body is manufactured in a separate mold box which, in the case of the production of end-braced railway sleepers, includes a tensioning device which allows the tensioning of the tensioning wires after the concrete has hardened and is supported against the mold box before the concrete is poured. Then the concrete is poured in.
  • a prestressed concrete sleeper can also be produced using the carousel method.
  • prestressed and end-stressed railway sleepers can be produced in molding boxes. It would therefore be desirable to be able to manufacture pre-stressed and end-stressed railway sleepers in existing long beds.
  • the present invention is therefore based on the object of producing stable, prestressed and end-stressed railway sleepers in the long bed.
  • the method of the type mentioned at the beginning is characterized according to the invention in that a first and a second separating element for defining the length of a cast concrete element are fixed together with a clamping device with clamping elements between the two separating elements in the long bed, whereupon the cast concrete element is cast between the two separating elements and is at least partially cured in the long bed.
  • each concrete casting to be cast or each railway sleeper to be cast assigned two separate separating elements in order to define the length of the concrete casting.
  • a separate clamping device is arranged in each of the areas delimited by the two separating elements, with which the respective cast part can be clamped, with the clamping of the clamping elements being able to take place before the concrete is poured or only after the concrete has hardened. In this way, a large number of long-bed railway sleepers can be produced in one casting process.
  • the separating elements In addition, compared to the carousel method with molding boxes, while the long bed in the method according to the invention is still occupied by the separating elements, the clamping devices, possibly the concrete and also during the hardening of the concrete of a preceding batch, the separating elements with the clamping devices for a to prepare the subsequent batch outside of the long bed, so that when the long bed becomes free, they only have to be inserted and fixed in order to continue pouring the concrete immediately.
  • Preparing the tensioning device usually involves attaching the tensioning elements to a first abutment to be cast in and, in the case of end tensioning, encasing the tensioning wires with a formwork sleeve, which generally involves passing the wires through suitable hoses and threading on a second abutment so that it is clear that it represents a significant time saving if these steps can be performed outside of the long bed, while the long bed is already occupied, for example, by hardening concrete masses.
  • pre- or end-tensioned railway sleepers can thus be produced economically in existing long-bed plants with a high throughput rate, with the long-bed being able to be fed with concrete almost continuously, since the preparation of the clamping devices and the separating elements is already carried out during curing of the concrete outside of the long bed.
  • the procedure is preferably such that the cast concrete element is braced after the partial hardening of the concrete by tensioning the tensioning elements.
  • end-tensioned cast concrete parts or railway sleepers can now also be produced in the long bed, so that the advantages associated with end-tensioned railway sleepers can also be achieved in existing long-bed systems.
  • the procedure is such that the separating elements are fixed by means of a screw connection to a transverse plate supported on side elements of the long bed.
  • the separating elements have an L-shaped cross section, optionally with reinforcing ribs, in order to screw the separating elements into corresponding threads on the transverse plates.
  • the cross plates are held below the long bed on the two side elements and screwed to the separating elements. This creates a firm connection between the separating elements and the long bed, without the long bed itself being structurally redesigned must become.
  • the clamping elements can be designed in different ways. Within the scope of the present invention, however, it is preferred for the production of end-tensioned cast concrete elements that the tensioning elements are designed as tensioning wires, with the tensioning elements being guided in formwork sleeves in the area between the abutments.
  • the tension wires are cut to the appropriate length and inserted into the formwork sleeves, which are usually simple plastic hoses.
  • the formwork sleeves prevent direct contact and bonding with the concrete that will be cast later, so that after the concrete has hardened, the tensioning elements can be brought to the required tension through the entire length of the concrete casting and the concrete casting is consequently clamped together from the ends.
  • the tensioning elements or tensioning wires can be held in various suitable ways between the separating elements in the long bed. According to a preferred embodiment of the present invention, however, it is provided that the clamping elements are supported at their first end on an abutment designed as a fixed anchor element, which is preferably connected, in particular releasably connected, to the first separating element by means of at least one clamping screw. Because the tensioning wires are fixed to a fixed anchor element, the tensioning wires are firmly anchored in the concrete after the concrete has been poured and cured and can apply large tensioning forces to the cast concrete part in order to brace it.
  • one tensioning element or one tensioning wire can be fixed to one fixed anchor element, but it can also be provided that several tensioning elements, for example two Clamping elements are fixed to a common fixed anchor element.
  • the fixed anchor element is preferably designed as an anchor plate with a corresponding number of holes for accommodating the clamping elements, the clamping elements being fixed to the fixed anchor element with suitable means. Screw nuts, clamps or the like can be used for this purpose, but the clamping elements can also be caulked on the back of the fixed anchor elements.
  • the fixed anchor elements are fixed to the first separating element with appropriate spacers, for example by means of turnbuckles.
  • the final tensioning of the tensioning elements after the concrete has hardened is preferably carried out with the aid of tensioning nuts, which each interact with a corresponding thread on the second end of the tensioning elements.
  • the clamping nuts are supported on a clamping anchor element in the cast concrete part, so that when the clamping nuts are tightened, a tensile force is exerted on the clamping elements or clamping wires and the concrete is clamped together.
  • the method according to the invention is preferably further developed such that the clamping elements are each connected, in particular screwed, at their second end to a clamping sleeve which is supported on the second separating element.
  • the clamping sleeves are removed after the cast concrete element has been poured and the concrete has hardened, resulting in open depressions in the cast concrete part on the face side, which subsequently allow access to the second ends of the clamping elements in order to be able to attach and tighten the clamping nuts.
  • the method according to the invention can preferably be further developed such that at least one abutment designed as a clamping anchor element is cast into the concrete casting to support clamping nuts in the concrete casting.
  • the at least one clamping anchor element is preferably designed as an anchor plate with a plurality of holes for the clamping elements to pass through.
  • a preferred procedure provides for the tensioning elements to be partially tensioned before the concrete casting element is poured, with the tensioning force preferably being less than 10 kN per tensioning element.
  • a low clamping force is thus applied, which is just sufficient to bring the clamping elements into a straight position, with the clamping preferably taking place in that at least one end of the clamping elements is pulled towards the respective separating element after the separating elements have been fixed in the long bed.
  • first ends of the clamping elements are held on the first separating element via the at least one fixed anchor element and the at least one clamping screw, while the second ends of the clamping elements are pulled to the second separating element by means of the clamping sleeves.
  • the clamping sleeves are preferably screwed to the second ends of the clamping elements, so that the required clamping force can be applied by rotating the clamping sleeves.
  • This procedure for the production of prestressed cast concrete elements in the long bed has the advantage over the already known method for the production of prestressed cast concrete elements in the long bed that the separating elements can be prepared with the clamping devices for a subsequent batch outside the long bed, so that when the long bed becomes free, they only have to be removed must be used and fixed in order to proceed immediately with the pouring of the concrete.
  • a preferred embodiment provides that the separating elements are removed after initial hardening, but before the concrete has reached its final strength, the clamping elements are partially clamped, the cast concrete element is removed from the long bed and the clamping elements are then finally clamped. Because the clamping elements are partially clamped after initial hardening, the cast concrete element can be given the stability required for removal from the long bed after a short hardening time, so that removal can take place after a very short time. In particular, the cast concrete element can be removed from the long bed as early as 16-48 hours after casting. After removal, further hardening takes place outside of the long bed, with the final bracing of the cast concrete element taking place after a specified target strength has been reached. The partial clamping of the clamping elements preferably takes place to a clamping force of 20-50 kN per clamping element.
  • the device according to the invention for the production of a large number of cast concrete elements from prestressed concrete, in particular for the production of railway sleepers, in a long bed having a multiple of the length of a cast concrete element is characterized according to the invention in that it has a first and a second separating element with means for fixing the separating elements in the long bed and a clamping device with clamping elements, which is arranged between the two separating elements.
  • the device according to the invention can thus be used in a long bed, ie in an elongated mold whose length exceeds the length of a conventional railway sleeper many times over and in particular has a length of approx.
  • the clamping device between the two separating elements the cast part can be placed under tension before or after the at least partial hardening of the concrete.
  • a large number of devices according to the invention in a long bed a large number of railway sleepers can be produced in one casting process.
  • the clamping devices according to the invention can already be prepared outside of the long bed, while the concrete in the long bed is still hardening from the previous casting process, so that when the long bed is free, they only have to be used and fixed in order to immediately continue pouring the concrete.
  • the preparation or upgrading of the clamping device usually includes attaching the clamping elements to an abutment to be cast in, optionally encasing the clamping elements with a formwork sleeve, which generally involves passing the clamping elements through suitable hoses, and applying a second abutment so that it becomes clear that it represents a considerable time saving if these steps can be taken when the long bed is already occupied, for example, by hardening concrete masses.
  • end-tensioned railway sleepers can thus be produced economically in existing long-bed plants with a high throughput rate, with the long-bed being able to be fed with concrete almost continuously, since the preparation of the separating elements and clamping devices is already carried out while the concrete is hardening outside of the Long bed can be done.
  • the means for fixing the separating elements each comprise at least one screw for screwing into a corresponding thread of a transverse plate supported on side elements of the long bed.
  • the separating elements have an L-shaped cross section, possibly with reinforcing ribs, in order to screw the separating elements to the transverse plates.
  • the tensioning elements are preferably designed as tensioning wires. Furthermore, the tensioning elements are preferably guided in formwork sleeves in the area between the separating elements for the production of end-tensioned railway sleepers.
  • the clamping elements are cut to the appropriate length and inserted into the formwork sleeves, which are usually simple plastic hoses.
  • the formwork sleeves prevent direct contact and bonding with the concrete that will be poured later, so that the tensioning elements can be brought to the required tension along the entire length of the concrete casting after the concrete has hardened.
  • the device according to the invention is further developed such that the clamping elements are supported at their first end on at least one abutment designed as a fixed anchor element, which is preferably connected, preferably detachably connected, to the first separating element by means of at least one clamping screw.
  • the fixed anchor element is preferably designed as an anchor plate which has a plurality of holes for the passage of clamping elements.
  • the at least one fixed anchor element can be attached to the first separating element using at least one clamping screw, the clamping screw preferably being detachably connectable to the fixed anchor element so that the clamping screw can be removed and reused after the concrete has hardened.
  • the clamping sleeve serves to fasten the second end of the respective clamping element to the second separating element and, if desired, to exert a slight prestress on the clamping elements in order to prevent the clamping elements from sagging before casting.
  • the device according to the invention is preferably further developed such that the clamping sleeves are designed to have a recess for attaching clamping nuts to the second end of the clamping elements after demoulding to train.
  • the device according to the invention can preferably be further developed to the effect that for support of clamping nuts in the cast concrete part, at least one abutment designed as a clamping anchor element is arranged in the region of the second separating element.
  • a tensioning anchor element is preferably an anchor plate that is equipped with a corresponding number of holes for receiving the tensioning elements, the tensioning elements being provided with a thread at the second end, onto which tensioning nuts are screwed and screwed against the anchor plate.
  • the separating elements according to the invention can be removed from the long bed after the concrete has hardened, in that the separating elements are pulled axially from the railway sleepers. From this point of view it is possible with the device according to the invention to provide separating elements with a profile which gives a desired shaping of the end regions of the railway sleepers when the concrete is poured and hardened. In this context, it is particularly preferred that at least one of the separating elements has a negative mold for an end structure, in particular a chamfer on the end face of the cast concrete part.
  • railway sleepers should not necessarily have a purely cuboid shape at the ends and, in particular, railway sleepers are usually produced with chamfers, which in the prior art can only be produced after the concrete has hardened, for example by grinding or cutting the cast concrete part.
  • the invention provides two separating elements for each cast concrete element, i.e. two cast concrete parts are not separated from one another by a single separating element, the separating elements can be removed or pulled off the cast concrete parts axially, so that more complex shapes can also be cast that have a demoulding transverse to the longitudinal axis of the concrete casting would make it impossible.
  • a long bed is denoted by 1, where in 1 only a portion of such a long bed 1 is shown.
  • a first separating element 2 and a second separating element 3 are fixed to side elements 1' of the long bed 1 by means of a screw connection.
  • a clamping device 5 with clamping elements 6 is fixed between the two separating elements 2 and 3 .
  • a floor panel 4 delimits the long bed 1 at the bottom. Concrete can be poured into the casting space 7 in order to form a railway sleeper between the separating elements 2 and 3, in which the clamping device 6 is cast.
  • clamping elements 6 under Interposition of first fixed anchor elements or anchor plates 8 and further with the interposition of clamping screws 9 on the first separating element 2 are fixed.
  • the anchor plates 8 form a strong abutment in the concrete in order to be able to exert tension forces on the concrete.
  • clamping elements 6 penetrate with their second end areas clamping anchor elements or anchor plates 10 and are screwed to clamping sleeves 11 which are connected to the second separating element 3 .
  • the clamping sleeves 11 fix the second end of the clamping elements 6 during the casting and, after their removal from the hardened concrete, simultaneously create a depression which enables a clamping nut 12 to be screwed onto the second ends of the clamping elements 6 .
  • a recess can now be seen in the example of one of the clamping elements, which was created after a clamping sleeve 11 had been removed from the mold.
  • a clamping nut 12 can also be seen, which was screwed onto the second end of the clamping element 6 .
  • tightening the clamping nut 12 causes the tension wire 6, which is guided in a formwork sleeve 13, to be pulled in the direction of the arrow 14 and a clamping force is thereby exerted on the cast concrete part.
  • Figure 1 illustrates that the separators 2 or 3 may have a negative mold for an end structure such as a chamfer. This would not be possible if the separating elements of the present invention were not accessible from both sides, since such a structure cannot be demolded transversely to the axial direction.
  • the long bed 1 has a length that exceeds the length of a concrete casting by a multiple and that therefore a plurality of devices according to the invention can be arranged in a long bed 1 and a large number of railway sleepers can be produced.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer Vielzahl von Betongusselementen aus Spannbeton, insbesondere zur Herstellung von Eisenbahnschwellen, in einem ein Vielfaches der Länge eines Betongusselements aufweisenden Langbett, bei welchem zur Längendefinition der zu gießenden Betongusselemente Trennelemente in das Langbett eingesetzt werden, sowie eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens.The present invention relates to a method for producing a large number of cast concrete elements from prestressed concrete, in particular for the production of railway sleepers, in a long bed having a multiple of the length of a cast concrete element, in which separating elements are used in the long bed to define the length of the cast concrete elements to be cast, and a device for carrying out the method according to the invention.

US 4 272 875 A offenbart ein Verfahren und eine Vorrichtung zur Herstellung einer Vielzahl von Betongusselementen aus Faserverstärktem Beton, gemäß dem Oberbegriff des Anspruchs 1, bzw. Anspruch 11. Auf dem Gebiet der Eisenbahnschwellen aus Spannbeton unterscheidet man zwei Verfahren zur Übertragung einer Spannkraft auf das Betongusselement. U.S.A. 4,272,875 discloses a method and apparatus for producing a plurality of concrete castings from fiber reinforced concrete, according to the preamble of claim 1 and claim 11 respectively. In the field of prestressed concrete railway sleepers, there are two methods of transmitting a prestressing force to the concrete casting.

Zum Einen gibt es die Möglichkeit, einen direkten Verbund der Spannelemente bzw. der Spanndrähte mit dem Beton herzustellen, wobei eine Vorspannung auf eine Mehrzahl von Spannelementen zumeist in Form von Spanndrähten vor dem Gießen des Betons in ein entsprechend geformtes Formbett bzw. Spannbett aufgebracht wird. Die Spannelemente bzw. die Spanndrähte weisen hierbei zur Verbesserung der Haftung des Betons geeignete Oberflächenstrukturen bzw. eine deutliche Rauigkeit auf, um eine ausreichende Haftung des Betonelements zu erzielen, damit die gewünschte Vorspannung aufgebracht werden kann. Nach dem Aushärten des Betons wird die Vorspannung aufgehoben und die Spannelemente bzw. die Spanndrähte übertragen über den direkten Verbund mit dem Beton eine entsprechende Spannung auf den Betonkörper bspw. auf die Eisenbahnschwelle. Eine Übertragung der vollen Vorspannkraft ist bei der dergestalt vorgespannten Eisenbahnschwelle abhängig von der Betongüte und der Profilierung des Spanndrahtes, jedenfalls jedoch erst in einem deutlichen Abstand von den Stirnseiten der Betonschwelle wirksam. Daraus ergibt sich als Nachteil, dass die Endbereiche derart hergestellter Eisenbahnschwellen eine verminderte Festigkeit aufweisen und damit einhergehend zu vermehrter Rissbildung neigen. Die zulässige Liegezeit solcher Eisenbahnschwellen ist daher relativ begrenzt.On the one hand, there is the possibility of producing a direct bond between the clamping elements or the clamping wires and the concrete, with prestressing being applied to a plurality of clamping elements, usually in the form of clamping wires, before the concrete is poured into a correspondingly shaped mold bed or clamping bed. In order to improve the adhesion of the concrete, the clamping elements or the clamping wires have suitable surface structures or a clear roughness in order to achieve sufficient adhesion of the concrete element so that the desired prestressing can be applied. After the concrete has hardened, the prestressing is removed and the tensioning elements or the tensioning wires transfer a corresponding tension to the concrete body, for example to the railway sleeper, via the direct bond with the concrete. Transmission of the full prestressing force is effective in the case of a railway sleeper prestressed in this way, depending on the concrete quality and the profiling of the tension wire, but in any case only at a significant distance from the end faces of the concrete sleeper. The disadvantage of this is that the end areas of railway sleepers produced in this way have a reduced Have strength and, as a result, tend to increase cracking. The permissible service life of such railway sleepers is therefore relatively limited.

Ein anderes Konzept ist als Endverspannung bekannt, wobei die Spannkraft durch Spannen des Spanndrahtes erst nach dem Aushärten des Betons auf das Betongusselement bzw. die Eisenbahnschwelle aufgebracht wird. Hierzu darf das Spannelement bzw. der Spanndraht im Gegensatz zum Konzept der Vorspannung keine nennenswerte Haftung mit dem Beton des Gussteils aufweisen, da die Spannkraft lediglich auf geeignete Anker wirken soll.Another concept is known as end tensioning, in which the tensioning force is applied to the concrete casting element or the railway sleeper by tensioning the tensioning wire only after the concrete has hardened. In contrast to the concept of prestressing, the prestressing element or the prestressing wire must not have any significant adhesion to the concrete of the cast part, since the prestressing force should only act on suitable anchors.

Ein wesentlicher Vorteil der Endverankerung besteht darin, dass die Vorspannung über den gesamten Schwellenkörper konstant ist und damit die Rissanfälligkeit bei Beanspruchung auch im Endbereich der Betonschwelle deutlich reduziert werden kann.A significant advantage of the end anchorage is that the prestressing is constant over the entire sleeper body and thus the susceptibility to cracking under stress can also be significantly reduced in the end area of the concrete sleeper.

Als Fertigungsverfahren sind einerseits das Langbettverfahren für vorgespannte Eisenbahnschwellen und andererseits das Karussellverfahren vor allem für die Herstellung von endverspannten Betonschwellen bekannt.The long-bed method for prestressed railway sleepers on the one hand and the carousel method on the other hand are known as manufacturing processes, especially for the production of end-tensioned concrete sleepers.

Beim Langbettverfahren werden Stützbleche bzw. Trennelemente entsprechend der gewünschten Betonschwellenlänge in Langbetten eingebracht, wobei die Länge des Langbetts ein Vielfaches der Länge eines Betongusselements aufweist (ca. 100m). Über die gesamte Länge des Langbetts werden die Spanndrähte durch die Trennelemente gezogen und mittels eines gesonderten Spannrahmens oder mit Hilfe von Fundamenten mit entsprechenden Widerlagern gespannt. Danach erfolgt das Gießen des Betons.With the long-bed method, support plates or separating elements are placed in long beds according to the desired concrete sleeper length, with the length of the long bed being a multiple of the length of a cast concrete element (approx. 100m). The tensioning wires are pulled through the separating elements over the entire length of the long bed and tensioned using a separate tensioning frame or using foundations with appropriate abutments. Then the concrete is poured.

Im Karussellverfahren wird jeweils ein einzelner Schwellenkörper in einem eigenen Formkasten hergestellt, der im Falle der Herstellung von endverspannten Eisenbahnschwellen eine Spannvorrichtung beinhaltet, die das Spannen der Spanndrähte nach dem Aushärten des Betons erlaubt und vor dem Gießen des Betons gegen den Formkasten abgestützt ist. Danach wird der Beton eingefüllt. Alternativ kann im Karussellverfahren auch eine Betonschwelle mit Vorspannung hergestellt werden.In the carousel process, one individual at a time The sleeper body is manufactured in a separate mold box which, in the case of the production of end-braced railway sleepers, includes a tensioning device which allows the tensioning of the tensioning wires after the concrete has hardened and is supported against the mold box before the concrete is poured. Then the concrete is poured in. Alternatively, a prestressed concrete sleeper can also be produced using the carousel method.

Während im Langbettverfahren bisher nur vorgespannte Betonteile hergestellt werden können, die mit den genannten Nachteilen behaftet sind, können in Formkästen wiederum vorgespannte und endverspannte Eisenbahnschwellen hergestellt werden. Es wäre daher wünschenswert, vorgespannte und endverspannte Eisenbahnschwellen auch in bereits bestehenden Langbetten herstellen zu können.While the long-bed method has so far only been able to produce prestressed concrete parts, which are associated with the disadvantages mentioned, prestressed and end-stressed railway sleepers can be produced in molding boxes. It would therefore be desirable to be able to manufacture pre-stressed and end-stressed railway sleepers in existing long beds.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, stabile vorgespannte und endverspannte Eisenbahnschwellen im Langbett herzustellen.The present invention is therefore based on the object of producing stable, prestressed and end-stressed railway sleepers in the long bed.

Zur Lösung dieser Aufgabe ist das Verfahren der eingangs genannten Art erfindungsgemäß dadurch gekennzeichnet, dass jeweils ein erstes und ein zweites Trennelement zur Längendefinition eines Betongusselements zusammen mit einer Spannvorrichtung mit Spannelementen zwischen den beiden Trennelementen im Langbett festgelegt werden, woraufhin das Betongusselement zwischen den beiden Trennelementen gegossen und im Langbett zumindest teilweise ausgehärtet wird.To solve this problem, the method of the type mentioned at the beginning is characterized according to the invention in that a first and a second separating element for defining the length of a cast concrete element are fixed together with a clamping device with clamping elements between the two separating elements in the long bed, whereupon the cast concrete element is cast between the two separating elements and is at least partially cured in the long bed.

Bei dem erfindungsgemäßen Verfahren werden somit in einem Langbett, d.h. einer Gussform, deren Länge die Länge einer üblichen Eisenbahnschwelle um eine Vielfaches übersteigt und insbesondere eine Länge von 100 Metern und mehr aufweist, jedem zu gießenden Betongussteil bzw. jeder zu gießenden Eisenbahnschwelle zwei eigene Trennelemente zugeordnet, um die Länge des Betongussteils zu definieren. Weiters wird in jedem der derart durch die zwei Trennelemente begrenzten Bereiche eine eigene Spannvorrichtung angeordnet, mit der das jeweilige Gussteil gespannt werden kann, wobei das Verspannen der Spannelemente bereits vor dem Gießen des Betons oder erst nach dem Aushärten des Betons erfolgen kann. Auf diese Weise kann eine Vielzahl von Eisenbahnschwellen im Langbett in einem Gussvorgang hergestellt werden. Darüberhinaus kann gegenüber dem Karussellverfahren mit Formkästen schon während das Langbett beim erfindungsgemäßen Verfahren noch durch die Trennelemente, die Spannvorrichtungen, gegebenenfalls den Beton und auch während des Aushärtens des Betons einer vorangehenden Charge belegt ist, bereits damit begonnen werden, die Trennelemente mit den Spannvorrichtungen für eine nachfolgende Charge außerhalb des Langbetts vorzubereiten, sodass diese bei Freiwerden des Langbetts nur noch eingesetzt und festgelegt werden müssen, um umgehend mit dem Gießen des Betons fortzufahren. Das Vorbereiten der Spannvorrichtung umfasst üblicherweise das Anbringen der Spannelemente an einem ersten einzugießenden Widerlager und im Falle einer Endverspannung das Umhüllen der Spanndrähte mit einer Schalungshülse, was im Allgemeinen das Durchführen der Drähte durch geeignete Schläuche beinhaltet und das Auffädeln eines zweiten Widerlagers, sodass klar wird, dass es eine erhebliche Zeitersparnis darstellt, wenn diese Schritte außerhalb des Langbetts vorgenommen werden können, während das Langbett ohnehin bspw. durch aushärtende Betonmassen belegt ist. Demgegenüber muss beim Karussellverfahren zugewartet werden, bis die Formkästen nach dem Aushärten des Betons und der Entnahme der Betongussteile wieder frei sind, um mit dem Ausrüsten der Formkästen mit den Spannvorrichtungen beginnen zu können.In the method according to the invention are thus in a long bed, ie a mold whose length exceeds the length of a conventional railway sleeper by a multiple and in particular has a length of 100 meters and more, each concrete casting to be cast or each railway sleeper to be cast assigned two separate separating elements in order to define the length of the concrete casting. Furthermore, a separate clamping device is arranged in each of the areas delimited by the two separating elements, with which the respective cast part can be clamped, with the clamping of the clamping elements being able to take place before the concrete is poured or only after the concrete has hardened. In this way, a large number of long-bed railway sleepers can be produced in one casting process. In addition, compared to the carousel method with molding boxes, while the long bed in the method according to the invention is still occupied by the separating elements, the clamping devices, possibly the concrete and also during the hardening of the concrete of a preceding batch, the separating elements with the clamping devices for a to prepare the subsequent batch outside of the long bed, so that when the long bed becomes free, they only have to be inserted and fixed in order to continue pouring the concrete immediately. Preparing the tensioning device usually involves attaching the tensioning elements to a first abutment to be cast in and, in the case of end tensioning, encasing the tensioning wires with a formwork sleeve, which generally involves passing the wires through suitable hoses and threading on a second abutment so that it is clear that it represents a significant time saving if these steps can be performed outside of the long bed, while the long bed is already occupied, for example, by hardening concrete masses. In contrast, with the carousel method, you have to wait until the mold boxes are free again after the concrete has hardened and the cast concrete parts have been removed in order to start with the Being able to start equipping the mold boxes with the clamping devices.

Mit dem erfindungsgemäßen Verfahren können somit auf ökonomische Weise in bereits bestehenden Langbett-Anlagen vor- oder endverspannte Eisenbahnschwellen mit einer hohen Durchsatzrate hergestellt werden, wobei das Langbett beinahe ständig mit Beton beschickt werden kann, da die Vorbereitung der Spannvorrichtungen und der Trennelemente bereits während des Aushärtens des Betons außerhalb des Langbetts erfolgen kann.With the method according to the invention, pre- or end-tensioned railway sleepers can thus be produced economically in existing long-bed plants with a high throughput rate, with the long-bed being able to be fed with concrete almost continuously, since the preparation of the clamping devices and the separating elements is already carried out during curing of the concrete outside of the long bed.

Bevorzugt wird bei der Ausführung des erfindungsgemäßen Verfahrens so vorgegangen, dass das Betongusselement nach dem teilweisen Aushärten des Betons unter Spannen der Spannelemente verspannt wird. Auf diese Weise können nun auch im Langbett endverspannte Betongussteile bzw. Eisenbahnschwellen hergestellt werden, sodass die mit endverspannten Eisenbahnschwellen verbundenen Vorteile auch in bereits bestehenden Langbett-Anlagen erzielt werden können.When carrying out the method according to the invention, the procedure is preferably such that the cast concrete element is braced after the partial hardening of the concrete by tensioning the tensioning elements. In this way, end-tensioned cast concrete parts or railway sleepers can now also be produced in the long bed, so that the advantages associated with end-tensioned railway sleepers can also be achieved in existing long-bed systems.

Bei der Ausführung des erfindungsgemäßen Verfahrens wird gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung dergestalt vorgegangen, dass die Trennelemente mittels Schraubverbindung an einem an Seitenelementen des Langbetts abgestützten Querblech festgelegt werden. Hierzu weisen die Trennelemente einen L-förmigen Querschnitt auf, gegebenenfalls mit Verstärkungsrippen, um die Trennelemente in entsprechenden Gewinden der Querbleche zu verschrauben. Die Querbleche werden unterhalb des Langbetts an die beiden Seitenelementen gehalten und mit den Trennelementen verschraubt. Dadurch wird eine feste Verbindung zwischen den Trennelementen und dem Langbett geschaffen, ohne dass das Langbett selbst baulich umgestaltet werden muss.In carrying out the method according to the invention, according to a preferred embodiment of the present invention, the procedure is such that the separating elements are fixed by means of a screw connection to a transverse plate supported on side elements of the long bed. For this purpose, the separating elements have an L-shaped cross section, optionally with reinforcing ribs, in order to screw the separating elements into corresponding threads on the transverse plates. The cross plates are held below the long bed on the two side elements and screwed to the separating elements. This creates a firm connection between the separating elements and the long bed, without the long bed itself being structurally redesigned must become.

Die Spannelemente können auf verschiedene Art und Weise ausgebildet werden. Im Rahmen der vorliegenden Erfindung ist es jedoch zur Herstellung von endverspannten Betongusselementen bevorzugt, dass die Spannelemente als Spanndrähte ausgeführt sind, wobei die Spannelemente im Bereich zwischen den Widerlagern in Schalungshülsen geführt werden. Die Spanndrähte werden hierbei in der entsprechenden Länge zurechtgeschnitten und in die Schalungshülsen, in der Regel einfache Kunststoffschläuche, eingeführt. Die Schalungshülsen verhindern einen direkten Kontakt und Verbund mit dem später vergossenen Beton, damit die Spannelemente nach dem Aushärten des Betons durch die gesamte Länge des Betongussteils auf die erforderliche Spannung gebracht werden können und das Betongussteil folglich von den Enden her zusammengespannt wird.The clamping elements can be designed in different ways. Within the scope of the present invention, however, it is preferred for the production of end-tensioned cast concrete elements that the tensioning elements are designed as tensioning wires, with the tensioning elements being guided in formwork sleeves in the area between the abutments. The tension wires are cut to the appropriate length and inserted into the formwork sleeves, which are usually simple plastic hoses. The formwork sleeves prevent direct contact and bonding with the concrete that will be cast later, so that after the concrete has hardened, the tensioning elements can be brought to the required tension through the entire length of the concrete casting and the concrete casting is consequently clamped together from the ends.

Die Spannelemente bzw. Spanndrähte können auf verschiedene Weise geeignet zwischen den Trennelementen im Langbett gehalten werden. Gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung ist es jedoch vorgesehen, dass die Spannelemente an ihrem ersten Ende an einem als Festankerelement ausgebildeten Widerlager abgestützt werden, welches bevorzugt mittels wenigstens einer Spannschraube mit dem ersten Trennelement verbunden, insbesondere lösbar verbunden wird. Dadurch, dass die Spanndrähte an einem Festankerelement festgelegt werden, sind die Spanndrähte nach dem Gießen und Aushärten des Betons fest im Beton verankert und können große Spannkräfte auf das Betongussteil aufbringen, um dieses zu verspannen. Im Rahmen der vorliegenden Erfindung kann jeweils ein Spannelement bzw. jeweils ein Spanndraht an jeweils einem Festankerelement festgelegt werden, es kann jedoch auch vorgesehen sein, dass mehrere Spannelemente, zum Beispiel zwei Spannelemente an einem gemeinsamen Festankerelement festgelegt werden. Das Festankerelement ist im Rahmen der vorliegenden Erfindung bevorzugt als Ankerplatte mit einer entsprechenden Anzahl an Löchern für die Aufnahme der Spannelemente ausgebildet, wobei die Spannelemente mit geeigneten Mitteln an dem Festankerelement festgelegt werden. Hierfür kommen insbesondere Schraubenmuttern, Klammern oder ähnliches in Frage, die Spannelemente können jedoch auch an der Rückseite der Festankerelemente verstemmt werden. Die Festankerelemente wiederum werden mit entsprechenden Distanzstücken, beispielsweise mittels Spannschrauben, am ersten Trennelement festgelegt.The tensioning elements or tensioning wires can be held in various suitable ways between the separating elements in the long bed. According to a preferred embodiment of the present invention, however, it is provided that the clamping elements are supported at their first end on an abutment designed as a fixed anchor element, which is preferably connected, in particular releasably connected, to the first separating element by means of at least one clamping screw. Because the tensioning wires are fixed to a fixed anchor element, the tensioning wires are firmly anchored in the concrete after the concrete has been poured and cured and can apply large tensioning forces to the cast concrete part in order to brace it. Within the scope of the present invention, one tensioning element or one tensioning wire can be fixed to one fixed anchor element, but it can also be provided that several tensioning elements, for example two Clamping elements are fixed to a common fixed anchor element. In the context of the present invention, the fixed anchor element is preferably designed as an anchor plate with a corresponding number of holes for accommodating the clamping elements, the clamping elements being fixed to the fixed anchor element with suitable means. Screw nuts, clamps or the like can be used for this purpose, but the clamping elements can also be caulked on the back of the fixed anchor elements. The fixed anchor elements, in turn, are fixed to the first separating element with appropriate spacers, for example by means of turnbuckles.

Die Endverspannung der Spannelemente nach dem Härten des Betons erfolgt bevorzugt mit der Hilfe von Spannmuttern, die jeweils mit einem entsprechenden Gewinde am zweiten Ende der Spannelemente zusammenwirken. Die Spannmuttern stützen sich hierbei an einem Spannankerelement im Betongussteil ab, sodass beim Anziehen der Spannmuttern eine Zugkraft auf die Spannelemente bzw. Spanndrähte ausgeübt und der Beton zusammengespannt wird.The final tensioning of the tensioning elements after the concrete has hardened is preferably carried out with the aid of tensioning nuts, which each interact with a corresponding thread on the second end of the tensioning elements. The clamping nuts are supported on a clamping anchor element in the cast concrete part, so that when the clamping nuts are tightened, a tensile force is exerted on the clamping elements or clamping wires and the concrete is clamped together.

Um die Spannmuttern für das Endverspannen frei zugänglich zu halten, ist das erfindungsgemäße Verfahren bevorzugt dahingehend weitergebildet, dass die Spannelemente jeweils an ihrem zweiten Ende mit einer Spannhülse verbunden, insbesondere verschraubt werden, die sich am zweiten Trennelement abstützt. Die Spannhülsen werden nach dem Gießen des Betongusselements und nach dem Härten des Betons entfernt, sodass stirnseitig offene Vertiefungen im Betongussteil resultieren, die in der Folge den Zugang zu den zweiten Enden der Spannelemente ermöglichen, um die Spannmuttern anbringen und festziehen zu können.In order to keep the clamping nuts freely accessible for final clamping, the method according to the invention is preferably further developed such that the clamping elements are each connected, in particular screwed, at their second end to a clamping sleeve which is supported on the second separating element. The clamping sleeves are removed after the cast concrete element has been poured and the concrete has hardened, resulting in open depressions in the cast concrete part on the face side, which subsequently allow access to the second ends of the clamping elements in order to be able to attach and tighten the clamping nuts.

Wie schon im Zusammenhang mit den ersten Enden der Spannelemente erläutert, kann das erfindungsgemäße Verfahren bevorzugt dahingehend weitergebildet werden, dass zur Abstützung von Spannmuttern im Betongussteil zumindest ein als Spannankerelement ausgebildetes Widerlager in das Betongusselement eingegossen wird. Das wenigstens eine Spannankerelement ist im Rahmen der vorliegenden Erfindung bevorzugt als Ankerplatte mit einer Mehrzahl von Löchern für den Durchtritt der Spannelemente ausgebildet.As already explained in connection with the first ends of the clamping elements, the method according to the invention can preferably be further developed such that at least one abutment designed as a clamping anchor element is cast into the concrete casting to support clamping nuts in the concrete casting. Within the scope of the present invention, the at least one clamping anchor element is preferably designed as an anchor plate with a plurality of holes for the clamping elements to pass through.

Um ein Durchhängen der Spannelemente vor dem Gießen des Betons zu verhindern, sieht eine bevorzugte Verfahrensweise vor, dass die Spannelemente vor dem Gießen des Betongusselements teilgespannt werden, wobei die Spannkraft bevorzugt weniger als 10 kN je Spannelement beträgt. Es wird somit eine geringe Spannkraft aufgebracht, die gerade ausreicht, um die Spannelemente in eine gerade Lage zu bringen, wobei das Spannen bevorzugt dadurch erfolgt, dass wenigsten ein Ende der Spannelemente zu dem jeweiligen Trennelement hingezogen wird, nachdem die Trennelemente im Langbett festgelegt wurden. Bevorzugt ist hierbei vorgesehen, dass die ersten Enden der Spannelemente über das wenigstens eine Festankerelement und die wenigstens eine Spannschraube am ersten Trennelement festgehalten werden, während die zweiten Enden der Spannelemente mittels der Spannhülsen zu dem zweiten Trennelement gezogen werden. Die Spannhülsen sind wie bereits erwähnt bevorzugt mit den zweiten Enden der Spannelemente verschraubt, sodass die erforderliche Spannkraft durch Verdrehen der Spannhülsen aufgebracht werden kann.In order to prevent the tensioning elements from sagging before the concrete is poured, a preferred procedure provides for the tensioning elements to be partially tensioned before the concrete casting element is poured, with the tensioning force preferably being less than 10 kN per tensioning element. A low clamping force is thus applied, which is just sufficient to bring the clamping elements into a straight position, with the clamping preferably taking place in that at least one end of the clamping elements is pulled towards the respective separating element after the separating elements have been fixed in the long bed. It is preferably provided here that the first ends of the clamping elements are held on the first separating element via the at least one fixed anchor element and the at least one clamping screw, while the second ends of the clamping elements are pulled to the second separating element by means of the clamping sleeves. As already mentioned, the clamping sleeves are preferably screwed to the second ends of the clamping elements, so that the required clamping force can be applied by rotating the clamping sleeves.

Zur Herstellung von vorgespannten Betongusselementen kann das erfindungsgemäße Verfahren gemäß einer bevorzugten Alternative dergestalt weitergebildet sein, dass die Spannelemente vor dem Gießen der Betongusselemente gespannt werden. In diesem Fall werden die Spannelemente ohne Schalungshülsen und gegebenenfalls mit einer entsprechenden Oberflächenstruktur ausgebildet, um einen möglichst festen und direkten Verbund der Spannelemente bzw. der Spanndrähte mit dem Beton herzustellen. Dieses Vorgehen zur Herstellung von vorgespannten Betongusselementen im Langbett hat gegenüber dem bereits bekannten Verfahren zur Herstellung von vorgespannten Betongusselementen im Langbett den Vorteil, dass die Trennelemente mit den Spannvorrichtungen für eine nachfolgende Charge außerhalb des Langbetts vorbereitet werden können, sodass diese bei Freiwerden des Langbetts nur noch eingesetzt und festgelegt werden müssen, um umgehend mit dem Gießen des Betons fortzufahren.For the production of prestressed cast concrete elements, the method according to the invention can be used according to a preferred alternative be further developed in such a way that the clamping elements are clamped before the pouring of the cast concrete elements. In this case, the tensioning elements are designed without formwork sleeves and, if necessary, with a corresponding surface structure in order to produce as strong and direct a connection as possible between the tensioning elements or the tensioning wires and the concrete. This procedure for the production of prestressed cast concrete elements in the long bed has the advantage over the already known method for the production of prestressed cast concrete elements in the long bed that the separating elements can be prepared with the clamping devices for a subsequent batch outside the long bed, so that when the long bed becomes free, they only have to be removed must be used and fixed in order to proceed immediately with the pouring of the concrete.

Um die Durchsatzrate weiter zu erhöhen, sieht eine bevorzugte Ausführungsform vor, dass die Trennelemente nach einem ersten Erhärten, aber vor dem Erreichen der Endfestigkeit des Betons entfernt werden, die Spannelemente teilgespannt, das Betongusselement aus dem Langbett entnommen und die Spannelemente danach endverspannt werden. Dadurch, dass die Spannelemente nach einem ersten Erhärten teilgespannt werden, kann dem Betongusselement bereits nach kurzer Erhärtungszeit eine für die Entnahme aus dem Langbett erforderliche Stabilität verliehen werden, sodass die Entnahme nach überaus kurzer Zeit erfolgen kann. Insbesondere kann die Entnahme des Betongusselements aus dem Langbett bereits 16-48 Stunden nach dem Gießen erfolgen. Nach der Entnahme erfolgt das weitere Aushärten außerhalb des Langbetts, wobei die Endverspannung des Betongusselements nach Erreichen einer vorgegebenen Zielfestigkeit erfolgt. Bevorzugt erfolgt das Teilspannen der Spannelemente auf eine Spannkraft von 20-50 kN je Spannelement.In order to further increase the throughput rate, a preferred embodiment provides that the separating elements are removed after initial hardening, but before the concrete has reached its final strength, the clamping elements are partially clamped, the cast concrete element is removed from the long bed and the clamping elements are then finally clamped. Because the clamping elements are partially clamped after initial hardening, the cast concrete element can be given the stability required for removal from the long bed after a short hardening time, so that removal can take place after a very short time. In particular, the cast concrete element can be removed from the long bed as early as 16-48 hours after casting. After removal, further hardening takes place outside of the long bed, with the final bracing of the cast concrete element taking place after a specified target strength has been reached. The partial clamping of the clamping elements preferably takes place to a clamping force of 20-50 kN per clamping element.

Die erfindungsgemäße Vorrichtung zur Herstellung einer Vielzahl von Betongusselementen aus Spannbeton, insbesondere zur Herstellung von Eisenbahnschwellen, in einem ein Vielfaches der Länge eines Betongusselements aufweisenden Langbett ist erfindungsgemäß dadurch gekennzeichnet, dass sie ein erstes und ein zweites Trennelement mit Mitteln zur Festlegung der Trennelemente in dem Langbett sowie eine Spannvorrichtung mit Spannelementen umfasst, die zwischen den beiden Trennelementen angeordnet ist. Die erfindungsgemäße Vorrichtung kann somit in einem Langbett, d.h. in einer länglichen Gussform, deren Länge die Länge einer üblichen Eisenbahnschwelle um eine Vielfaches übersteigt und insbesondere eine Länge von ca. 100 Metern und mehr aufweist, für jedes zu gießendes Betongussteil bzw. jede zu gießende Eisenbahnschwelle angeordnet und festgelegt werden, um die Länge des Betongussteils zu definieren. Mit der Spannvorrichtung zwischen den zwei Trennelementen kann vor oder nach dem zumindest teilweisen Aushärten des Betons das Gussteil unter Spannung gesetzt werden. Mit einer Vielzahl von erfindungsgemäßen Vorrichtungen in einem Langbett kann eine Vielzahl von Eisenbahnschwellen in einem Gussvorgang hergestellt werden. Die erfindungsgemäßen Spannvorrichtungen können außerhalb des Langbetts schon vorbereitet werden, während der Beton im Langbett vom vorangehenden Gussvorgang noch aushärtet, sodass diese bei Freiwerden des Langbetts nur noch eingesetzt und festgelegt werden müssen, um sofort wieder mit dem Gießen des Betons fortzufahren. Das Vorbereiten bzw. Aufrüsten der Spannvorrichtung umfasst üblicherweise das Anbringen der Spannelemente an einem einzugießenden Widerlager, gegebenenfalls das Umhüllen der Spannelemente mit einer Schalungshülse, was im Allgemeinen das Durchführen der Spannelemente durch geeignete Schläuche beinhaltet, und das Aufbringen eines zweiten Widerlagers, sodass klar wird, dass es eine erhebliche Zeitersparnis darstellt, wenn diese Schritte vorgenommen werden können, wenn das Langbett ohnehin bspw. durch aushärtende Betonmassen belegt ist.The device according to the invention for the production of a large number of cast concrete elements from prestressed concrete, in particular for the production of railway sleepers, in a long bed having a multiple of the length of a cast concrete element is characterized according to the invention in that it has a first and a second separating element with means for fixing the separating elements in the long bed and a clamping device with clamping elements, which is arranged between the two separating elements. The device according to the invention can thus be used in a long bed, ie in an elongated mold whose length exceeds the length of a conventional railway sleeper many times over and in particular has a length of approx. 100 meters and more, for each cast concrete part to be cast or each railway sleeper to be cast arranged and fixed to define the length of the concrete casting. With the clamping device between the two separating elements, the cast part can be placed under tension before or after the at least partial hardening of the concrete. With a large number of devices according to the invention in a long bed, a large number of railway sleepers can be produced in one casting process. The clamping devices according to the invention can already be prepared outside of the long bed, while the concrete in the long bed is still hardening from the previous casting process, so that when the long bed is free, they only have to be used and fixed in order to immediately continue pouring the concrete. The preparation or upgrading of the clamping device usually includes attaching the clamping elements to an abutment to be cast in, optionally encasing the clamping elements with a formwork sleeve, which generally involves passing the clamping elements through suitable hoses, and applying a second abutment so that it becomes clear that it represents a considerable time saving if these steps can be taken when the long bed is already occupied, for example, by hardening concrete masses.

Mit der erfindungsgemäßen Vorrichtung können somit auf ökonomische Weise in bereits bestehenden Langbett-Anlagen endverspannte Eisenbahnschwellen mit einer hohen Durchsatzrate hergestellt werden, wobei das Langbett beinahe ständig mit Beton beschickt werden kann, da die Vorbereitung der Trennelemente und Spannvorrichtungen bereits während des Aushärtens des Betons außerhalb des Langbetts erfolgen kann.With the device according to the invention, end-tensioned railway sleepers can thus be produced economically in existing long-bed plants with a high throughput rate, with the long-bed being able to be fed with concrete almost continuously, since the preparation of the separating elements and clamping devices is already carried out while the concrete is hardening outside of the Long bed can be done.

Gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung umfassen die Mittel zur Festlegung der Trennelemente jeweils wenigstens eine Schraube zum Einschrauben in ein entsprechendes Gewinde eines an Seitenelementen des Langbetts abgestützten Querblechs. Hierzu weisen die Trennelemente einen L-förmigen Querschnitt, gegebenenfalls mit Verstärkungsrippen auf, um die Trennelemente mit den Querblechen zu verschrauben.According to a preferred embodiment of the present invention, the means for fixing the separating elements each comprise at least one screw for screwing into a corresponding thread of a transverse plate supported on side elements of the long bed. For this purpose, the separating elements have an L-shaped cross section, possibly with reinforcing ribs, in order to screw the separating elements to the transverse plates.

Bevorzugt sind die Spannelemente als Spanndrähte ausgeführt. Weiters sind die Spannelemente im Bereich zwischen den Trennelementen zur Herstellung von endverspannten Eisenbahnschwellen bevorzugt in Schalungshülsen geführt. Die Spannelemente werden hierbei in der entsprechenden Länge zurechtgeschnitten und in die Schalungshülsen, in der Regel einfache Kunststoffschläuche eingeführt. Die Schalungshülsen verhindern einen direkten Kontakt und Verbund mit dem später gegossenen Beton, damit die Spannelemente nach dem Aushärten des Betons durch die gesamte Länge des Betongussteils auf die erforderliche Spannung gebracht werden können.The tensioning elements are preferably designed as tensioning wires. Furthermore, the tensioning elements are preferably guided in formwork sleeves in the area between the separating elements for the production of end-tensioned railway sleepers. The clamping elements are cut to the appropriate length and inserted into the formwork sleeves, which are usually simple plastic hoses. The formwork sleeves prevent direct contact and bonding with the concrete that will be poured later, so that the tensioning elements can be brought to the required tension along the entire length of the concrete casting after the concrete has hardened.

Gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung ist die erfindungsgemäße Vorrichtung dahingehend weitergebildet, dass die Spannelemente an ihrem ersten Ende an wenigstens einem als Festankerelement ausgebildeten Widerlager abgestützt sind, welches bevorzugt mittels wenigstens einer Spannschraube mit dem ersten Trennelement verbunden, bevorzugt lösbar verbunden, ist. Das Festankerelement ist bevorzugt als Ankerplatte ausgebildet, die eine Mehrzahl von Löchern für den Durchtritt von Spannelementen aufweist. Das wenigstens eine Festankerelement kann mit Hilfe wenigstens einer Spannschraube an dem ersten Trennelement befestigt werden, wobei die Spannschraube bevorzugt lösbar mit dem Festankerelement verbindbar ist, damit die Spannschraube nach dem Härten des Betons entnommen und wiederverwendet werden kann.According to a preferred embodiment of the present According to the invention, the device according to the invention is further developed such that the clamping elements are supported at their first end on at least one abutment designed as a fixed anchor element, which is preferably connected, preferably detachably connected, to the first separating element by means of at least one clamping screw. The fixed anchor element is preferably designed as an anchor plate which has a plurality of holes for the passage of clamping elements. The at least one fixed anchor element can be attached to the first separating element using at least one clamping screw, the clamping screw preferably being detachably connectable to the fixed anchor element so that the clamping screw can be removed and reused after the concrete has hardened.

Bevorzugt ist weiters vorgesehen, dass mit dem zweiten Ende eines Spannelements jeweils eine Spannhülse verbunden, insbesondere verschraubt ist, die sich am zweiten Trennelement abstützt. Die Spannhülse dient dazu, das zweite Ende des jeweiligen Spannelements am zweiten Trennelement zu befestigen und sofern gewünscht eine geringe Vorspannung auf die Spannelemente auszuüben, um ein Durchhängen der Spannelemente vor dem Gießen zu verhindern.Provision is preferably also made for a clamping sleeve to be connected, in particular screwed, to the second end of a clamping element, which is supported on the second separating element. The clamping sleeve serves to fasten the second end of the respective clamping element to the second separating element and, if desired, to exert a slight prestress on the clamping elements in order to prevent the clamping elements from sagging before casting.

Um am zweiten Ende der Spannelemente eine freie Zugänglichkeit für das Anbringen der Spannmuttern für das Endverspannen zu gewährleisten, ist die erfindungsgemäße Vorrichtung bevorzugt dahingehend weitergebildet, dass die Spannhülsen ausgebildet sind, um nach dem Entformen eine Vertiefung zum Anbringen von Spannmuttern auf das zweite Ende der Spannelemente auszubilden.In order to ensure free accessibility at the second end of the clamping elements for attaching the clamping nuts for final clamping, the device according to the invention is preferably further developed such that the clamping sleeves are designed to have a recess for attaching clamping nuts to the second end of the clamping elements after demoulding to train.

Wie schon im Zusammenhang mit den ersten Enden der Spannelemente erläutert, kann die erfindungsgemäße Vorrichtung bevorzugt dahingehend weitergebildet sein, dass zur Abstützung von Spannmuttern im Betongussteil zumindest ein als Spannankerelement ausgebildetes Widerlager im Bereich des zweiten Trennelements angeordnet ist. Ein Spannankerelement ist im Rahmen der vorliegenden Erfindung bevorzugt eine Ankerplatte, die mit einer entsprechenden Anzahl an Löchern für die Aufnahme der Spannelemente ausgestattet ist, wobei die Spannelemente am zweiten Ende mit einem Gewinde versehen sind, auf welches Spannmuttern aufgeschraubt und gegen die Ankerplatte geschraubt werden.As already explained in connection with the first ends of the clamping elements, the device according to the invention can preferably be further developed to the effect that for support of clamping nuts in the cast concrete part, at least one abutment designed as a clamping anchor element is arranged in the region of the second separating element. In the context of the present invention, a tensioning anchor element is preferably an anchor plate that is equipped with a corresponding number of holes for receiving the tensioning elements, the tensioning elements being provided with a thread at the second end, onto which tensioning nuts are screwed and screwed against the anchor plate.

Die erfindungsgemäßen Trennelemente können nach dem Aushärten des Betons aus dem Langbett entnommen werden, indem die Trennelemente axial von den Eisenbahnschwellen gezogen werden. Unter diesem Gesichtspunkt ist es mit der erfindungsgemäßen Vorrichtung möglich, Trennelemente mit einer Profilierung zu versehen, die eine gewünschte Formung der Endbereiche der Eisenbahnschwellen ergeben, wenn der Beton gegossen und ausgehärtet wird. In diesem Zusammenhang ist es besonders bevorzugt, dass zumindest eines der Trennelemente eine Negativform für eine Endstruktur, insbesondere eine stirnseitige Anfasung am Betongussteil aufweist. Eisenbahnschwellen sollen aus verschiedenen Gründen an den Enden nicht unbedingt eine rein quaderförmige Form aufweisen und insbesondere werden Eisenbahnschwellen in der Regel mit Anfasungen hergestellt, die im Stand der Technik lediglich nach dem Aushärten des Betons beispielsweise durch Schleifen oder Schneiden des Betongussteils hergestellt werden können. Dadurch, dass die Erfindung jeweils zwei Trennelemente für jedes Betongusselement vorsieht, d.h., dass nicht zwei Betongussteile durch ein einziges Trennelement voneinander getrennt werden, können die Trennelemente axial von den Betongussteilen abgenommen bzw. abgezogen werden, sodass auch komplexere Formen gegossen werden können, die eine Entformung quer zur Längsachse des Betongussteils verunmöglichen würden.The separating elements according to the invention can be removed from the long bed after the concrete has hardened, in that the separating elements are pulled axially from the railway sleepers. From this point of view it is possible with the device according to the invention to provide separating elements with a profile which gives a desired shaping of the end regions of the railway sleepers when the concrete is poured and hardened. In this context, it is particularly preferred that at least one of the separating elements has a negative mold for an end structure, in particular a chamfer on the end face of the cast concrete part. For various reasons, railway sleepers should not necessarily have a purely cuboid shape at the ends and, in particular, railway sleepers are usually produced with chamfers, which in the prior art can only be produced after the concrete has hardened, for example by grinding or cutting the cast concrete part. Because the invention provides two separating elements for each cast concrete element, i.e. two cast concrete parts are not separated from one another by a single separating element, the separating elements can be removed or pulled off the cast concrete parts axially, so that more complex shapes can also be cast that have a demoulding transverse to the longitudinal axis of the concrete casting would make it impossible.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert. In dieser zeigen

  • Fig. 1 eine perspektivische Gesamtdarstellung der erfindungsgemäßen Vorrichtung,
  • Fig. 2 eine perspektivische Detaildarstellung des ersten Endbereichs der erfindungsgemäßen Vorrichtung,
  • Fig. 3 eine perspektivische Detaildarstellung des zweiten Endbereichs der erfindungsgemäßen Vorrichtung,
  • Fig. 4 eine perspektivische Detaildarstellung des zweiten Endbereichs der erfindungsgemäßen Vorrichtung in einer vergrößerten Darstellung,
  • Fig. 5 eine perspektivische Darstellung eines Trennelements der erfindungsgemäßen Vorrichtung sowie
  • Fig. 6 ein Ansicht mit mehreren erfindungsgemäßen Vorrichtungen in einem Langbett.
The invention is explained in more detail below with reference to an exemplary embodiment shown schematically in the drawing. in this show
  • 1 a perspective overall view of the device according to the invention,
  • 2 a detailed perspective view of the first end area of the device according to the invention,
  • 3 a perspective detail view of the second end area of the device according to the invention,
  • 4 a perspective detailed view of the second end area of the device according to the invention in an enlarged view,
  • figure 5 a perspective view of a separating element of the device according to the invention and
  • 6 a view with several devices according to the invention in a long bed.

In Fig. 1 ist ein Langbett mit 1 bezeichnet, wobei in Fig. 1 lediglich ein Abschnitt eines solchen Langbetts 1 dargestellt ist. Im Langbett 1 sind ein erstes Trennelement 2 und ein zweites Trennelement 3 mittels einer Schraubverbindung an Seitenelementen 1' des Langbetts 1 festgelegt. Eine Spannvorrichtung 5 mit Spannelementen 6 ist zwischen den beiden Trennelementen 2 und 3 festgelegt. Ein Bodenblech 4 begrenzt das Langbett 1 nach unten. In den Gussraum 7 kann Beton gegossen werden, um zwischen den Trennelementen 2 und 3 eine Eisenbahnschwelle auszubilden, in die die Spannvorrichtung 6 eingegossen ist.In 1 a long bed is denoted by 1, where in 1 only a portion of such a long bed 1 is shown. In the long bed 1, a first separating element 2 and a second separating element 3 are fixed to side elements 1' of the long bed 1 by means of a screw connection. A clamping device 5 with clamping elements 6 is fixed between the two separating elements 2 and 3 . A floor panel 4 delimits the long bed 1 at the bottom. Concrete can be poured into the casting space 7 in order to form a railway sleeper between the separating elements 2 and 3, in which the clamping device 6 is cast.

In Fig. 2 ist zu erkennen, dass die Spannelemente 6 unter Zwischenschaltung von ersten Festankerelementen bzw. Ankerplatten 8 und weiters unter Zwischenschaltung von Spannschrauben 9 am ersten Trennelement 2 festgelegt sind. Die Ankerplatten 8 bilden im Beton ein starkes Widerlager, um Spannkräfte auf den Beton ausüben zu können.In 2 it can be seen that the clamping elements 6 under Interposition of first fixed anchor elements or anchor plates 8 and further with the interposition of clamping screws 9 on the first separating element 2 are fixed. The anchor plates 8 form a strong abutment in the concrete in order to be able to exert tension forces on the concrete.

In Fig. 3 ist dargestellt, dass die Spannelemente 6 mit ihren zweiten Endbereichen Spannankerelemente bzw. Ankerplatten 10 durchsetzen und mit Spannhülsen 11 verschraubt sind, die mit dem zweiten Trennelement 3 verbunden sind. Die Spannhülsen 11 fixieren das zweite Ende der Spannelemente 6 während des Gießens und schaffen nach ihrer Entnahme aus dem gehärteten Beton gleichzeitig jeweils eine Vertiefung, welche das Aufschrauben einer Spannmutter 12 auf die zweiten Enden der Spannelemente 6 ermöglicht.In 3 it is shown that the clamping elements 6 penetrate with their second end areas clamping anchor elements or anchor plates 10 and are screwed to clamping sleeves 11 which are connected to the second separating element 3 . The clamping sleeves 11 fix the second end of the clamping elements 6 during the casting and, after their removal from the hardened concrete, simultaneously create a depression which enables a clamping nut 12 to be screwed onto the second ends of the clamping elements 6 .

In Fig. 4 ist nun am Beispiel eines der Spannelemente eine Vertiefung zu erkennen, die nach dem Entformen einer Spannhülse 11 entstanden ist. Weiters ist eine Spannmutter 12 zu erkennen, die auf das zweite Ende des Spannelements 6 aufgeschraubt wurde. Wenn nun die Ankerplatte 10 im Betongussteil eingebettet ist, führt ein Anziehen der Spannmutter 12 dazu, dass der Spanndraht 6, der in einer Schalungshülse 13 geführt ist, in Richtung des Pfeils 14 gezogen wird und dadurch eine Spannkraft auf das Betongussteil ausgeübt wird.In 4 a recess can now be seen in the example of one of the clamping elements, which was created after a clamping sleeve 11 had been removed from the mold. A clamping nut 12 can also be seen, which was screwed onto the second end of the clamping element 6 . When the anchor plate 10 is now embedded in the cast concrete part, tightening the clamping nut 12 causes the tension wire 6, which is guided in a formwork sleeve 13, to be pulled in the direction of the arrow 14 and a clamping force is thereby exerted on the cast concrete part.

Fig. 5 veranschaulicht, dass die Trennelemente 2 oder 3 eine Negativform für eine Endstruktur wie zum Beispiel eine Anfasung aufweisen können. Dies wäre nicht möglich, wenn die Trennelemente der vorliegenden Erfindung nicht beidseitig zugänglich wären, da sich eine solche Struktur nicht quer zur Achsrichtung entformen lässt. figure 5 Figure 1 illustrates that the separators 2 or 3 may have a negative mold for an end structure such as a chamfer. This would not be possible if the separating elements of the present invention were not accessible from both sides, since such a structure cannot be demolded transversely to the axial direction.

Fig. 6 zeigt schließlich, dass das Langbett 1 eine Länge aufweist, die die Länge eines Betongussteils um ein Vielfaches übersteigt und dass daher in einem Langbett 1 ein Mehrzahl von erfindungsgemäßen Vorrichtungen angeordnet und eine große Zahl an Eisenbahnschwellen hergestellt werden kann. 6 finally shows that the long bed 1 has a length that exceeds the length of a concrete casting by a multiple and that therefore a plurality of devices according to the invention can be arranged in a long bed 1 and a large number of railway sleepers can be produced.

Claims (18)

  1. Method for the production of a plurality of concrete cast elements of prestressed concrete, in particular for the production of railway sleepers, in a long bed (1) which is a multiple of the length of a concrete cast element, in which separating elements (2,3) are installed in the long bed (1) to define the length of each of the concrete cast elements to be cast, characterized in that a first and a second separating element (2,3) for defining the length of a concrete cast element together with a tensioning device (5) with tensioning elements (6) for tensioning the concrete cast element between the two separating elements (2,3) are mounted in the long bed (1), whereupon the concrete cast element is cast between the two separating elements (2,3) and is at least partially hardened in the long bed (1).
  2. Method according to claim 1, characterized in that the concrete cast element is tensioned after the partial hardening of the concrete by tensioning the tensioning elements (6).
  3. Method according to claim 1 or 2, characterized in that the separating elements (2, 3) are mounted by means of a screw connection to transverse metal sheets supported on side elements (1') of the long bed (1).
  4. Method according to claim 1, 2 or 3, characterized in that the tensioning elements (6) are guided in formwork sleeves (13) in the area between abutments (8, 10) and are preferably designed as tensioning wires.
  5. Method according to any one of claims 1 to 4, characterized in that the tensioning elements (6) are supported at their first end on at least one abutment (8) designed as a fixed anchor element, which is preferably connected, in particular releasably connected, to the first separating element (2) by means of at least one tensioning screw (9).
  6. Method according to any one of claims 1 to 5, characterized in that the tensioning elements (6) are each connected, in particular screwed, at their second end to a tensioning sleeve (11) which is supported on the second separating element (3).
  7. Method according to any one of claims 1 to 6, characterized in that the tensioning elements (6) are partially tensioned before the concrete cast element is cast, the tensioning force preferably being less than 10 kN per tensioning element, the tensioning preferably being carried out by means of the tensioning sleeves (11).
  8. Method according to any one of claims 1 to 7, characterized in that at least one abutment (10) designed as a tensioning anchor element is cast into the concrete cast element in order to support the tensioning nuts (12) in the cast concrete part.
  9. Method according to any one of claims 1 to 8, characterized in that the separating elements (2, 3) are removed before the final strength of the concrete is reached, the tensioning elements (6) are partially tensioned, the concrete cast element is removed from the long bed and the tensioning elements (6) are then tensioned to final tension.
  10. Method according to claim 1, 3, 5, 6, 7 or 8, characterized in that the tensioning elements (6) are tensioned before the concrete cast elements are cast.
  11. Device for producing a plurality of concrete cast elements of prestressed concrete, in particular for producing railway sleepers, in a long bed (1) which is a multiple of the length of a concrete cast element, characterized in that the device comprises a first and a second separating element (2, 3) with means for mounting the separating elements (2,3) in the long bed (1) and a tensioning device (5) with tensioning elements (6) which is arranged between the two separating elements (2,3).
  12. Device according to claim 11, characterized in that the means for mounting the separating elements each comprise at least one screw for screwing into a corresponding thread of a transverse metal sheet supported on side elements (1') of the long bed (1).
  13. Device according to claim 11 or 12, characterized in that the tensioning elements (6) are guided in formwork sleeves (13) in the area between abutments (8, 10) and are preferably designed as tensioning wires.
  14. Device according to claim 11, 12 or 13, characterized in that the tensioning elements (6) are supported at their first end on at least one abutment (8) designed as a fixed anchor element, which is preferably connected, preferably releasably connected, to the first separating element (2) by means of at least one tensioning screw (9).
  15. Device according to any one of claims 11 to 14, characterized in that a tensioning sleeve (11) is each connected, in particular screwed, to the second end of a tensioning element (6) and is supported on the second separating element (3).
  16. Device according to claim 15, characterized in that the tensioning sleeves (11) are designed to form a recess for attaching tensioning nuts (12) to the second end of the tensioning elements (6) after removal from the mold.
  17. Device according to any one of claims 11 to 16, characterized in that at least one abutment (10) designed as a tensioning anchor element is arranged in the area of the second separating element (3) to support the tensioning nuts (12) .
  18. Device according to any one of claims 11 to 17, characterized in that at least one of the separating elements (2, 3) has a negative mold for an end structure, in particular a bevel on the frontal face on the concrete cast element.
EP19450007.0A 2019-04-23 2019-04-23 Method for producing a plurality of cast elements made of prestressed concrete Active EP3730263B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP19450007.0A EP3730263B1 (en) 2019-04-23 2019-04-23 Method for producing a plurality of cast elements made of prestressed concrete
PL19450007T PL3730263T3 (en) 2019-04-23 2019-04-23 Method for producing a plurality of cast elements made of prestressed concrete
US17/605,462 US12011849B2 (en) 2019-04-23 2020-04-22 Method of producing a plurality of concrete cast elements
PCT/IB2020/053793 WO2020217181A1 (en) 2019-04-23 2020-04-22 Method for producing a plurality of concrete castings
SA521430650A SA521430650B1 (en) 2019-04-23 2021-10-21 Method of producing a plurality of concrete cast elements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19450007.0A EP3730263B1 (en) 2019-04-23 2019-04-23 Method for producing a plurality of cast elements made of prestressed concrete

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EP3730263A1 EP3730263A1 (en) 2020-10-28
EP3730263B1 true EP3730263B1 (en) 2022-03-09

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EP (1) EP3730263B1 (en)
PL (1) PL3730263T3 (en)
SA (1) SA521430650B1 (en)
WO (1) WO2020217181A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1007718A (en) * 1948-03-23 1952-05-09 Sncf Method and device for the manufacture of railway sleepers, beams and similar parts in prestressed concrete
CH386667A (en) * 1960-03-24 1965-01-15 Brandestini Antonio Process for the production of prestressed prestressed concrete components in the prestressed bed
SE421333B (en) * 1979-06-12 1981-12-14 Frank Otto Silvander DEVICE FOR ALIGNMENT OF THE FINAL FITTINGS WHEN PASTING THE CONCRETE PILLARS
FR2498976A1 (en) * 1981-02-04 1982-08-06 Borcoman Mircea METHOD, DEVICES, MOLD-SUPPORTING STRUCTURES AND FACILITIES FOR IMPROVING THE EFFICIENCY OF PROCESSES FOR THE MANUFACTURE OF PRE-STRESSED CONCRETE PRODUCTS

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EP3730263A1 (en) 2020-10-28
US20220212365A1 (en) 2022-07-07
WO2020217181A1 (en) 2020-10-29
PL3730263T3 (en) 2022-06-20
SA521430650B1 (en) 2022-07-21

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